초록 ▼

This invention relates to damping pads and accoustical horns for use with transducer assemblies. The problems of proximity detection ranges, subfreezing operating temperature ranges, ringing and backwave reflection are addressed. In a preferred embodiment of an ultrasonic level control indicator usi

This invention relates to damping pads and accoustical horns for use with transducer assemblies. The problems of proximity detection ranges, subfreezing operating temperature ranges, ringing and backwave reflection are addressed. In a preferred embodiment of an ultrasonic level control indicator using a piezoelectric transducer, a resilient, compressible sound absorbing damping material (like polyurethane pads) is compressed against the transducer vibrating member to decrease ringing and backwave effects. An acoustical horn assembly with a tapered opening is positioned adjacent the transducer to improve the signal.

대표청구항 ▼

The combination in an electroacoustic transducer, of a cup-shaped housing having front and side walls, the front wall comprising an oscillating diaphragm, a piezoelectric element being bonded to the oscillating member interiorly of the cup, a resilient, compressible material located interiorly of sa

The combination in an electroacoustic transducer, of a cup-shaped housing having front and side walls, the front wall comprising an oscillating diaphragm, a piezoelectric element being bonded to the oscillating member interiorly of the cup, a resilient, compressible material located interiorly of said cup, clamping means for holding said material under compression within the cup, said clamping means providing pressure to hold said resilient compressed material in pressure contact with the piezoelectric element and with the diaphragm member, electrodes attached to the surface of said piezoelectric element and means comprising electrical conductors connected to said electrodes for delivering electrical impulses for driving said piezoelectric element.